Question

Simplify:
cos^2(x) - 1 + sin^2(x) + sin(x)

I have rewritten it to be:
cos^2(x)+ sin^2(x) + sin(x) - 1
= 1-1+sin(x), so I get sinx as a result.
Am I thinking right?

Answer 1

@phi, just need a quick look. Thank you.

Answer 2

yes, that looks good
\[ \cos^2(x) - 1 + \sin^2(x) + \sin(x) \\
(1- \sin^2(x)) - 1 + \sin^2(x) + \sin(x) \\1- 1 - \sin^2(x) + \sin^2(x) + \sin(x) \\\sin(x)
\]

Answer 3

Thank you!